(х – 2)(х^2 + 3) – х^3
х^3 + 3х – 2х^2 – 6 – х^3
– 2х^2 + 3х – 6
(x+12,3)/2-3=(1,5-x)/2
x+12,3-6=1,5-x
2x=7,5-12,3
2x=-4,8
x=-2,4
5Y = 5Y
( 4X + 1)^2 = ( X + 4)^2
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16X^2 + 8X + 1 = X^2 + 8X + 16
16X^2 - X^2 + 8X - 8X = 16 - 1
15X^2 = 15
X^2 = 1
X1 = 1
X2 = - 1
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5Y = X^2 + 8X + 16
5Y = 1 + 8 + 16 = 25
Y1 = 5
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5Y = 1 - 8 + 16 = 9
Y2= 9/5 = 1,8
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Ответ ( 1 ; 5 ) ; ( - 1 ; 1,8 )
1-cosx/sinx*sinx = 1/sin^2x - cosx/sin^2x